... sequent to evaporation of the organic layer gave 2.3 g. (46%) of recovered starting material, identified by the method of mixture melting points; and 0.5 g. (14.8%) of 4- triphenylsilyl-10- ethylphenothiaaine, mp 164-166". ... Chem. SOC., 75, 2693 (1953). ... After re- (13) R. West, J. Am. ...