Chloromethyl Trimethylsilyl Ether

ClCH2OSiMe3

[23586-77-8]  · C4H11ClOSi  · Chloromethyl Trimethylsilyl Ether  · (MW 138.67)

(hydroxymethyl cation equivalent1)

Physical Data: only characterized by 1H and 13C NMR at -50 °C.

Solubility: sol dichloromethane.

Preparative Method: prepared in situ under nitrogen by addition of a cooled (-78 °C) solution of Sulfuryl Chloride (1 equiv) in dry dichloromethane (2 M) to a solution of ethyl (trimethylsilyloxy)methyl sulfide in dichloromethane (1 M).1

Handling, Storage, and Precautions: low stability; best prepared in situ at low temperature.

Hydroxymethyl Cation Equivalent.

Chloromethyl trimethylsilyl ether, prepared in situ at -78 °C in dichloromethane, reacts with 1-(trimethylsilyloxy)cyclopentene (3 equiv) and a catalytic amount of Zinc Bromide (10 mol %) to give 2-hydroxymethylcyclopentanone in 71% yield (eq 1).1 Since the preparation of chloromethyl trimethylsilyl ether generates an equivalent amount of ethylsulfenyl chloride, 2-ethylthiocyclopentanone is also obtained. Overall, this reagent provides a method for a-hydroxymethylation of carbonyl compounds.


1. Gundersen, L.-L.; Benneche, T. ACS 1991, 45, 975.

Yeun-Min Tsai

National Taiwan University, Taipei, Republic of China



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