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[ CAS No. 6372-42-5 ] {[proInfo.proName]}

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Cat. No.: {[proInfo.prAm]}
Chemical Structure| 6372-42-5
Chemical Structure| 6372-42-5
Structure of 6372-42-5 * Storage: {[proInfo.prStorage]}
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Product Details of [ 6372-42-5 ]

CAS No. :6372-42-5 MDL No. :MFCD00046360
Formula : C18H21P Boiling Point : -
Linear Structure Formula :- InChI Key :ZXKWUYWWVSKKQZ-UHFFFAOYSA-N
M.W : 268.33 Pubchem ID :80756
Synonyms :

Calculated chemistry of [ 6372-42-5 ]

Physicochemical Properties

Num. heavy atoms : 19
Num. arom. heavy atoms : 12
Fraction Csp3 : 0.33
Num. rotatable bonds : 3
Num. H-bond acceptors : 0.0
Num. H-bond donors : 0.0
Molar Refractivity : 86.86
TPSA : 13.59 Ų

Pharmacokinetics

GI absorption : High
BBB permeant : Yes
P-gp substrate : No
CYP1A2 inhibitor : Yes
CYP2C19 inhibitor : No
CYP2C9 inhibitor : Yes
CYP2D6 inhibitor : Yes
CYP3A4 inhibitor : No
Log Kp (skin permeation) : -4.49 cm/s

Lipophilicity

Log Po/w (iLOGP) : 3.51
Log Po/w (XLOGP3) : 4.86
Log Po/w (WLOGP) : 4.45
Log Po/w (MLOGP) : 5.01
Log Po/w (SILICOS-IT) : 5.6
Consensus Log Po/w : 4.68

Druglikeness

Lipinski : 1.0
Ghose : None
Veber : 0.0
Egan : 0.0
Muegge : 1.0
Bioavailability Score : 0.55

Water Solubility

Log S (ESOL) : -4.83
Solubility : 0.00393 mg/ml ; 0.0000146 mol/l
Class : Moderately soluble
Log S (Ali) : -4.88
Solubility : 0.00354 mg/ml ; 0.0000132 mol/l
Class : Moderately soluble
Log S (SILICOS-IT) : -6.46
Solubility : 0.0000926 mg/ml ; 0.000000345 mol/l
Class : Poorly soluble

Medicinal Chemistry

PAINS : 0.0 alert
Brenk : 1.0 alert
Leadlikeness : 1.0
Synthetic accessibility : 4.55

Safety of [ 6372-42-5 ]

Signal Word:Warning Class:N/A
Precautionary Statements:P280-P305+P351+P338 UN#:N/A
Hazard Statements:H302 Packing Group:N/A
GHS Pictogram:

Application In Synthesis of [ 6372-42-5 ]

* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.

  • Downstream synthetic route of [ 6372-42-5 ]

[ 6372-42-5 ] Synthesis Path-Downstream   1~88

  • 3
  • [ 6372-42-5 ]
  • [ 63699-00-3 ]
  • 4
  • [ 6372-42-5 ]
  • [ 13689-20-8 ]
YieldReaction ConditionsOperation in experiment
99% With water; Selectfluor; In acetonitrile; at 20℃; for 0.166667h; General procedure: To a solution of 1 (0.2 mmol) in 2 mL of CH3CN/H2O(v/v = 100/1) was added Selectfluor (71 mg, 0.2 mmol). The mixture was stirred at room temperature for 5-60minutes. After removal of the solvent, the residue was then purified by flash column chromatography on silica gel with petroleum ether/ethyl acetate to give the desired product 2.
99% With 4-phenylthioxanthone; In methanol; at 20℃; under 760.051 Torr; for 1.33333h;Irradiation; General procedure: 1a (70.5 mg, 0.20 mmol), 4-phenylthioxanthone (3 mg, 0.01 mmol), CH3OH (30 mL) were added to a pyrex reaction flash which was equipped with a magnetic stirrer. The mixture was irradiated by a 23 W household lamp at rt under air atmosphere. The photoreaction was completed after 40 minutes as monitored by TLC (eluent: petroleum ether). The solvent was removed and the residue was purified by flash column chromatography on silica gel (eluent: petroleum ether/ethyl acetate = 10/1?EA) to afford 2a as a solid (74 mg, 100%); 1H NMR (400 MHz, CDCl3) delta 7.56 (dd, J = 11.6, 8.8 Hz, 6 H), 6.95 (dd, J = 8.8, 2.0 Hz, 6 H), 3.83 (s, 9 H).
  • 6
  • [ 131379-54-9 ]
  • [ 1079-66-9 ]
  • [ 6372-42-5 ]
  • 8
  • C18H21P*H(1+)*BF4(1-) [ No CAS ]
  • [ 672-66-2 ]
  • C8H11P*H(1+)*BF4(1-) [ No CAS ]
  • [ 6372-42-5 ]
  • 9
  • C8H11P*H(1+)*BF4(1-) [ No CAS ]
  • [ 6372-42-5 ]
  • C18H21P*H(1+)*BF4(1-) [ No CAS ]
  • [ 672-66-2 ]
  • 10
  • C18H21P*H(1+)*BF4(1-) [ No CAS ]
  • [ 6372-44-7 ]
  • C14H23P*BF4(1-)*H(1+) [ No CAS ]
  • [ 6372-42-5 ]
  • 11
  • C14H23P*BF4(1-)*H(1+) [ No CAS ]
  • [ 6372-42-5 ]
  • C18H21P*H(1+)*BF4(1-) [ No CAS ]
  • [ 6372-44-7 ]
  • 12
  • C13H13P*BF4(1-)*H(1+) [ No CAS ]
  • [ 6372-42-5 ]
  • C18H21P*H(1+)*BF4(1-) [ No CAS ]
  • [ 1486-28-8 ]
  • 13
  • C14H15P*BF4(1-)*H(1+) [ No CAS ]
  • [ 6372-42-5 ]
  • C18H21P*H(1+)*BF4(1-) [ No CAS ]
  • [ 607-01-2 ]
  • 14
  • triphenylphosphine [ No CAS ]
  • [ 6372-42-5 ]
  • C18H21P*H(1+)*BF4(1-) [ No CAS ]
  • [ 1038-95-5 ]
  • 15
  • C18H21P*H(1+)*BF4(1-) [ No CAS ]
  • [ 1486-28-8 ]
  • C13H13P*BF4(1-)*H(1+) [ No CAS ]
  • [ 6372-42-5 ]
  • 16
  • C18H21P*H(1+)*BF4(1-) [ No CAS ]
  • [ 607-01-2 ]
  • C14H15P*BF4(1-)*H(1+) [ No CAS ]
  • [ 6372-42-5 ]
  • 17
  • C18H21P*H(1+)*BF4(1-) [ No CAS ]
  • [ 1038-95-5 ]
  • triphenylphosphine [ No CAS ]
  • [ 6372-42-5 ]
  • 19
  • [ 6372-42-5 ]
  • disodium salt of the bis(m-sulfonatophenyl)cyclohexylphosphane [ No CAS ]
  • 20
  • [ 6372-42-5 ]
  • C18H19O7PS2(2-)*2Na(1+) [ No CAS ]
  • 21
  • [ 6372-42-5 ]
  • [ 72144-85-5 ]
  • 22
  • [ 6372-42-5 ]
  • [ 72144-87-7 ]
  • 23
  • [ 6372-42-5 ]
  • [ 72144-88-8 ]
  • 24
  • [ 1336-21-6 ]
  • [ 931-51-1 ]
  • [ 644-97-3 ]
  • [ 100-58-3 ]
  • [ 6372-42-5 ]
YieldReaction ConditionsOperation in experiment
70% With hydrogenchloride; In water; EXAMPLE 7 154 ml of a 1.72 Molar titrated solution of 0.266 mole of cyclohexylmagnesium chloride in ether was added dropwise to a stirred solution of 47.54 g (0.2656 mole) of phenyldichlorophosphine in 400 ml of anhydrous ether, maintained at +10 C. under an inert atmosphere. After the addition was complete the mixture was stirred for 15 minutes at +10 C. A 2.0 Molar solution of 0.319 mole of phenylmagnesium bromide in 159 ml of ether was then added dropwise at a temperature of between +10 and +22 C. The mixture was warmed to reflux for one-half hour, then cooled to +6 C. and treated dropwise with 160 ml of water then 14 ml of concentrated hydrochloric acid. The mixture was made basic with 10 ml of concentrated ammonium hydroxide (to pH=9) and the ether phase was separated, dried with magnesium sulfate and concentrated to yield a yellow waxy solid. Recrystallization from ethanol gave cyclohexyldiphenylphosphine. MP=52.5-57.5 C., 31 P-NMR delta=-1.97 ppm (relative intensity 999.93) and delta=-1.25 ppm (dicyclohexylphenylphosphine impurity-relative intensity=13.25), Yield=about 70%.
  • 25
  • [ 626-62-0 ]
  • [ 17154-34-6 ]
  • [ 6372-42-5 ]
  • 26
  • [ 626-62-0 ]
  • [ 1213-51-0 ]
  • [ 6372-42-5 ]
  • 27
  • [ 131379-54-9 ]
  • [ 17154-34-6 ]
  • [ 6372-42-5 ]
  • 28
  • [ 131379-54-9 ]
  • [ 1213-51-0 ]
  • [ 6372-42-5 ]
  • 29
  • [ 1295-35-8 ]
  • [ 7446-09-5 ]
  • [ 6372-42-5 ]
  • bis(cyclohexyldiphenylphosphane)-sulfur dioxide-nickel(0) * 1.5 tetrahydrofuran [ No CAS ]
  • 30
  • [ 1295-35-8 ]
  • [ 7446-09-5 ]
  • [ 6372-42-5 ]
  • tris(cyclohexyldiphenylphosphane)-(sulfur dioxide)-nickel(0) [ No CAS ]
  • bis(cyclohexyldiphenylphosphane)-bis(sulfur dioxide)-nickel(0) * tetrahydrofuran [ No CAS ]
  • 31
  • [ 75-24-1 ]
  • [ 6372-42-5 ]
  • (CH3)3AlP(C6H5)2(C6H11) [ No CAS ]
  • 32
  • [ 102349-56-4 ]
  • [ 603-32-7 ]
  • [ 6372-42-5 ]
  • [ 118518-35-7 ]
  • 33
  • [ 102349-56-4 ]
  • [ 603-35-0 ]
  • [ 6372-42-5 ]
  • [ 118518-33-5 ]
  • 34
  • [ 102349-56-4 ]
  • [ 603-33-8 ]
  • [ 6372-42-5 ]
  • MoI2(CO)3(Bi(C6H5)3)P(C6H5)2(C6H11)*CH2Cl2 [ No CAS ]
  • 35
  • [ 102349-56-4 ]
  • [ 603-36-1 ]
  • [ 6372-42-5 ]
  • [ 118518-37-9 ]
  • 36
  • [ 113350-36-0 ]
  • [ 603-32-7 ]
  • [ 6372-42-5 ]
  • [ 118518-36-8 ]
  • 37
  • [ 113350-36-0 ]
  • [ 603-35-0 ]
  • [ 6372-42-5 ]
  • [ 118518-34-6 ]
  • 38
  • [ 113350-36-0 ]
  • [ 603-36-1 ]
  • [ 6372-42-5 ]
  • [ 118519-05-4 ]
  • 39
  • (η(5)-methylcyclopentadienyl)Fe(CO)2Me [ No CAS ]
  • [ 6372-42-5 ]
  • [ 117228-45-2 ]
  • 40
  • cyclopentadienylchromiumtricarbonyl [ No CAS ]
  • [ 6372-42-5 ]
  • (η5-C5H5)Cr(CO)2(cyclohexyldiphenylphosphine) [ No CAS ]
  • 41
  • dicarbonyl(cyclopentadienyl)methyliron(II) [ No CAS ]
  • [ 6372-42-5 ]
  • [ 117228-10-1 ]
  • 42
  • [ 111187-48-5 ]
  • [ 6372-42-5 ]
  • [ 123863-47-8 ]
  • 43
  • bis(cyclopentadienylchromium tricarbonyl) [ No CAS ]
  • [ 6372-42-5 ]
  • (η5-C5H5)Cr(CO)2(cyclohexyldiphenylphosphine) [ No CAS ]
  • C5H5Cr(CO)2(C6H11P(C6H5)2)H [ No CAS ]
  • 44
  • ammonium hexafluorophosphate [ No CAS ]
  • [ 12257-42-0 ]
  • [ 1333-74-0 ]
  • [ 6372-42-5 ]
  • Rh(3+)*2C6H11P(C6H5)2*2H(1-)*2(CH3)2CO*PF6(1-)={Rh(C6H11P(C6H5)2)2H2((CH3)2CO)2}PF6 [ No CAS ]
  • 49
  • [ 29892-37-3 ]
  • [ 6372-42-5 ]
  • [ 209847-83-6 ]
  • 50
  • {H3O}(1+)*{Au(NO3)4}(1-)={H3O}{Au(NO3)4} [ No CAS ]
  • [ 6372-42-5 ]
  • [ 79634-33-6 ]
  • 51
  • [ 130638-61-8 ]
  • [ 6372-42-5 ]
  • {W(CO)(PCyPh2)2(S2CNC4H8)(η2-MeC2Me)}{BPh4} [ No CAS ]
  • 52
  • trans-{Pt(Mo(CO)3(η-C5H5))2(PhCN)2} [ No CAS ]
  • [ 6372-42-5 ]
  • {Pt2Mo2(CO)6(C5H5)2(P(C6H5)2(C6H11))2} [ No CAS ]
  • 53
  • [ 1871-57-4 ]
  • disodium tetracarbonylferrate [ No CAS ]
  • [ 6372-42-5 ]
  • (C(CH2)3)Fe(CO)2(P(C6H11)(C6H5)2) [ No CAS ]
  • 54
  • hexaaquanickel(II) tetrafluoroborate [ No CAS ]
  • [ 6737-42-4 ]
  • [ 143-66-8 ]
  • [ 6372-42-5 ]
  • {(dppp)(P(C6H11)Ph2)(NO)Ni}(BPh4) [ No CAS ]
  • 55
  • hexaaquanickel(II) tetrafluoroborate [ No CAS ]
  • [ 143-66-8 ]
  • [ 6372-42-5 ]
  • [ 1663-45-2 ]
  • {(1,2-bis(diphenylphosphino)ethane)(PPh2(C6H11))(NO)Ni}(BPh4) [ No CAS ]
  • 56
  • {((OCH3)2C9H5)Rh(CO)2} [ No CAS ]
  • [ 6372-42-5 ]
  • {((OCH3)2C9H5)Rh(CO)(P(C6H11)(C6H5)2)} [ No CAS ]
  • 57
  • {((CH3)4C9H3)Rh(CO)2} [ No CAS ]
  • [ 6372-42-5 ]
  • {((CH3)4C9H3)Rh(CO)(P(C6H11)(C6H5)2)} [ No CAS ]
  • 58
  • [(η5-C9H4Me3)Rh(CO)2] [ No CAS ]
  • [ 6372-42-5 ]
  • {((CH3)3C9H4)Rh(CO)(P(C6H11)(C6H5)2)} [ No CAS ]
  • 59
  • [(η5-C9Me7)Rh(CO)2] [ No CAS ]
  • [ 6372-42-5 ]
  • {((CH3)7C9)Rh(CO)(P(C6H11)(C6H5)2)} [ No CAS ]
  • 60
  • [ 484-11-7 ]
  • [ 14057-91-1 ]
  • [ 6372-42-5 ]
  • Cu(2,9-dimethyl-1,10-phenanthroline)(cyclohexyldiphenylphosphine)2 perchlorate [ No CAS ]
  • 61
  • [ 306763-77-9 ]
  • [ 6372-42-5 ]
  • [ 155350-76-8 ]
  • 62
  • [ 306763-77-9 ]
  • [ 6372-42-5 ]
  • [ 155350-72-4 ]
  • 63
  • bis(cyclopentadienylchromium tricarbonyl) [ No CAS ]
  • [ 6372-42-5 ]
  • C5H5Cr(CO)2(C6H11P(C6H5)2)H [ No CAS ]
  • 64
  • [ 139604-48-1 ]
  • [ 6372-42-5 ]
  • [ 148800-51-5 ]
  • 65
  • {WI2(CO)(NCCH3)(C6H5C2)2}2 [ No CAS ]
  • [ 6372-42-5 ]
  • {WI2(CO){P(C6H5)2(C6H11)}2(C6H5C2)2} [ No CAS ]
  • 66
  • [ 34482-49-0 ]
  • [ 6372-42-5 ]
  • (CO)4Mo(P(C2H5)2)2Mo(CO)3(P(C6H5)2(C6H11)) [ No CAS ]
  • 67
  • [ 101224-78-6 ]
  • [ 6372-42-5 ]
  • [ 101224-70-8 ]
  • 68
  • [ 34766-74-0 ]
  • [ 6372-42-5 ]
  • Os2(CO)6(μ-C4Ph4) [ No CAS ]
  • Os(CO)4PCyPh2 [ No CAS ]
  • Os(CO)3(PCyPh2)2 [ No CAS ]
  • Os2(CO)5(PCyPh2)(μ-C4Ph4) [ No CAS ]
  • 69
  • Ru5C(CO)14(P(OPh)3) [ No CAS ]
  • [ 6372-42-5 ]
  • Ru5C(CO)13(P(OPh)3)(PPh2Cy) [ No CAS ]
  • 70
  • Ru5C(CO)15 [ No CAS ]
  • [ 6372-42-5 ]
  • Ru5C(CO)15[P(C6H5)2(C6H11)] [ No CAS ]
  • 72
  • Pt(S,S-chiraphos)MeCl S,S-chiraphos=2S,3S-bis(diphenylphosphino)butane [ No CAS ]
  • [ 6372-42-5 ]
  • [Pt(S,S-chiraphos)CH3(PCyPh2)]ClO4 S,S-chiraphos=(-)-2S,3S-bis(diphenylphosphino)butane [ No CAS ]
  • 73
  • Pt(((C6H5)2P)2NCH(CH3)COOC2H5)CH3Cl [ No CAS ]
  • [ 6372-42-5 ]
  • [Pt(S-alap)CH3(PCyPh2)]ClO4 S-alap=(-)-N,N-bis(diphenylphosphino)-S-alanine ethyl ester [ No CAS ]
  • 74
  • Pt(((C6H5)2P)2NCH(CH3)C6H5)CH3Cl [ No CAS ]
  • [ 6372-42-5 ]
  • [Pt(S-peap)CH3(PCyPh2)]ClO4 S-peap=(-)-N,N-bis(diphenylphosphino)-S-α-phenylethylamine [ No CAS ]
  • 75
  • Co(Cp)(I)(S2CNMe2) [ No CAS ]
  • [ 6372-42-5 ]
  • (C5H5)Co(P(C6H5)2C6H11)(S2CN(CH3)2)(1+)*I(1-)=((C5H5)Co(P(C6H5)2C6H11)(S2CN(CH3)2))I [ No CAS ]
  • 76
  • Zeise's dimer [ No CAS ]
  • [ 6372-42-5 ]
  • [ 20611-44-3 ]
  • 77
  • [ 12130-66-4 ]
  • [ 692-50-2 ]
  • [ 6372-42-5 ]
  • [ 75506-19-3 ]
  • 78
  • chloromethyl{(+)-(2S,3S)-O-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane}platinum(II) [ No CAS ]
  • [ 6372-42-5 ]
  • [Pt((+)-diop)CH3(PCyPh2)]ClO4 (+)-diop=(+)-2S,3S-O-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane [ No CAS ]
  • 79
  • [ 10170-69-1 ]
  • [ 6372-42-5 ]
  • Mn2(CO)8((C6H11)P(C6H5)2)2 [ No CAS ]
  • 80
  • ruthenium trichloride hydrate [ No CAS ]
  • [ 542-92-7 ]
  • [ 6372-42-5 ]
  • [(η5-C5H5)Ru(P(C6H5)2(C6H11))2Cl] [ No CAS ]
  • 81
  • [ 67-56-1 ]
  • [ 14705-94-3 ]
  • [ 6372-42-5 ]
  • Re2(μ-O2CCH3)Cl3(OMe)2(PCyPh2)2 [ No CAS ]
  • 82
  • [methyl(1,2-ethanedithiolate)(pyridine)oxorhenium(V)] [ No CAS ]
  • [ 6372-42-5 ]
  • [ 110-86-1 ]
  • MeReO(edt)(PCyPh2) [ No CAS ]
  • 83
  • potassium cyanide [ No CAS ]
  • [ 111-48-8 ]
  • chloroauric acid [ No CAS ]
  • [ 6372-42-5 ]
  • cyano(cyclohexyldiphenylphosphine)gold(I) [ No CAS ]
  • 84
  • potassium cyanide [ No CAS ]
  • [ 29892-37-3 ]
  • [ 6372-42-5 ]
  • cyano(cyclohexyldiphenylphosphine)gold(I) [ No CAS ]
  • 85
  • CH3ReO(SCH2C6H4S)Cl(1-) [ No CAS ]
  • [ 6372-42-5 ]
  • CH3ReO(SCH2C6H4S)(P(C6H5)2C6H11) [ No CAS ]
  • 86
  • CH3ReO(SCH2C6H4S)(P(C6H5)2CH3) [ No CAS ]
  • [ 6372-42-5 ]
  • CH3ReO(SCH2C6H4S)(P(C6H5)2C6H11) [ No CAS ]
  • 87
  • [MeRe(O)(2-(mercaptomethyl)thiophenolate-S,S')(PPh3)] [ No CAS ]
  • [ 6372-42-5 ]
  • CH3ReO(SCH2C6H4S)(P(C6H5)2C6H11) [ No CAS ]
  • 88
  • [ 13689-20-8 ]
  • [ 6372-42-5 ]
YieldReaction ConditionsOperation in experiment
82% With copper(II) bis(trifluoromethanesulfonate); 1,1,3,3-tetramethyldisilazane; In toluene; at 80℃; Add <strong>[13689-20-8]cyclohexyldiphenylphosphine oxide</strong> (28.4 mg, 0.1 mmol) to the reaction flask.Copper triflate (3.6 mg, 0.01 mmol), tetramethyldisilazane (26.7 mg, 0.2 mmol) and toluene (1 mL), and the mixture was stirred at 80 C;TLC tracks the reaction until it is completely over;The crude product obtained after the completion of the reaction was recrystallized from toluene to give the desired product (yield: 82%).
82% With copper(II) bis(trifluoromethanesulfonate); 1,1,3,3-tetramethyldisilazane; In toluene; at 80℃; Add cyclohexyldiphenylphosphine (28.4 mg, 0.1 mmol), copper triflate (3.6 mg, 0.01 mmol),Tetramethyldisilazane (26.7 mg, 0.2 mmol) and toluene (1 mL), the mixture was stirred at 80oC;TLC follows the reaction to completion;The crude product obtained after the reaction was recrystallized from toluene to obtain the target product (yield 82%). The analytical data of the product are as follows:
73% With oxalyl dichloride; diethyl 2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate; triethylamine; In dichloromethane; at 40℃; for 2h;Inert atmosphere; General procedure: To a solution of tertiary phosphine oxides 2 (0.4mmol) in CH2Cl2 (2mL) was added oxalyl chloride (0.4mmol) dropwise at room temperature under an argon atmosphere. After 30min, HEH (1mmol) was added to the mixture in one portion as well as TEA (3mmol). The mixture was stirred for another 2h at 40C, and then diluted with H2O (10mL). The resulting mixture was extracted with CH2Cl2 repeatedly. The extracts were dried (anhydrous Na2SO4) and evaporated. The crude product was purified by column chromatography on silica gel using ethyl acetate/petroleum ether to afford the pure product.
With indium(III) bromide; 1,1,3,3-Tetramethyldisiloxane; In toluene; at 100℃; for 22h;Inert atmosphere; Sealed tube; General procedure: In a sealed tube containing a solution of the phosphine oxide derivative (5 mmol) in anhydrous toluene (1 M) was added InBr3 (1 mol %, 0.05 mmol) and the TMDS (1.5 equiv, 7.5 mmol) under an argon atmosphere. The reaction mixture was stirred at 100 C during 7-40 h depending on the substrate (the reaction was monitored by 31P NMR). After complete consumption of the reagent the mixture was kept under argon in the sealed tube and cooled to 0 C. A solution of BH3.SMe2 (2 M in THF, 1 equiv) was then slowly added. After 1 h at room temperature, 31P NMR analysis of an aliquot indicates complete conversion to phosphine borane adduct. The crude was poured in an erlenmeyer flask and silica gel was carefully added while stirring. When silica gel was added in the reaction mixture, a slightly exothermic reaction was observed. The reaction mixture was then filtered on silica gel and washed several times with ethyl acetate. After evaporation of the ethyl acetate, the residue was purified by flash chromatography on silica gel with pure cyclohexane to afford the desired phosphine-borane.

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