Carbon Dioxide → Triethyl(trifluoromethyl)silane

HRID 1085340Notes

Reaction equation

HRID 1085340 reaction equation
Cl[Si:2]([CH2:7][CH3:8])([CH2:5][CH3:6])[CH2:3][CH3:4].C(=O)=O.Br[C:13]([F:16])([F:15])[F:14].C(N(CC)P(N(CC)CC)N(CC)CC)C>CC(C)=O.ClCCl>[CH2:3]([Si:2]([CH2:7][CH3:8])([CH2:5][CH3:6])[C:13]([F:16])([F:15])[F:14])[CH3:4]

Participants

7

Reactant 4

HCID 280Carbon DioxideHCID 6384BromotrifluoromethaneHCID 13819ChlorotriethylsilaneHCID 75292Hexaethylphosphorous triamide

Product 1

HCID 4204914Triethyl(trifluoromethyl)silaneYield 69%

Reagents, catalysts & solvents 2

HCID 180AcetoneSolventHCID 6344DichloromethaneSolvent

Conditions

Temperature
-78 °C

Procedure

A flask equipped with a dry ice condenser was flame dried under a nitrogen stream, and charged with 25g (0.17 mol) of chlorotriethylsilane and 40 mL of dichloromethane. After cooling the resulting solution to -78° C. and charging the condenser with dry ice and acetone, 40 mL (0.43 mol) of bromotrifluoromethane (Freon 13B1) that had been condensed into a graduated tube was warmed to room temperature and allowed to distill into the flask. The cold solution was treated dropwise with 66mL (0.24 mol) of hexaethylphosphorous triamide, allowed to stir at -78° C. for two hours, and allowed to stir at room temperature overnight. Low boiling components were then short path distilled into a cold (-78° C.) receiving flask at>1 torr with the pot temperature kept at<50° C. The distillate was further fractionated by removal of the dichloromethane (40-45° C. at atmospheric pressure) and short path distillation to give 22.0 g of 98% pure (69% yield) triethyltrifluoromethylsilane: bp 52-54° C. at 10 torr; 1H NMR (CDCl3) δ 0.59-1.16 (m); 19F NMR (CDCl3, relative to CFCl3) -61.3 ppm (s); IR (neat) 2960, 2915, 2882, 1458, 1413, 1206, 1055, 1020, 734, 693 cm-1; mass spectrum (70 eV) m/z (relative intensity) 115 (66, M-CF3), 105 (46), 87 (85), 77 (100), 59 (56), 49 (41), 47 (37), 41 (38). Anal. Calcd. for C7H15F3Si: C, 45.62; H, 8.20. Found: C, 47.53; H, 8.56.

Workup

  1. customA flask equipped with a dry ice condenser
  2. temperaturewas flame
  3. customdried under a nitrogen stream
  4. customcondensed into a graduated tube
  5. temperaturewas warmed to room temperature
  6. distillationto distill into the flask
  7. stirringto stir at room temperature overnight
  8. distillationshort path distilled into a cold (-78° C.)
  9. customkept at<50° C
  10. customThe distillate was further fractionated by removal of the dichloromethane (40-45° C. at atmospheric pressure) and short path distillation

Sources & evidence

ORD record
ord-309ce9c582da41a7834ffe28853bec56
Source dataset
uspto-grants-1991_04
Patent number
US05008425

Reaction notes

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