... Page 7. 148 HELVETICA CHIMICA ACTA - Vol. 70 (1987) ... to the s of (CH,),Si of silylated compounds. GC/MS: Hewleft-Packard5970 mass spectrometer; compounds of low volatility were recorded with a VG-70-250 spectrometer. ... After I hat rt, the volume was reduced iu to ca. ...