2 n ch 3 2 0 1 9 m 1 2 ch ch 2 1 2 0 9 m 4 6 ch ch 3 0 7 0 5 m 0 96 sich 2 0 4 s 5 5 si ch 3 cyclic silazane 1 2 2 4 tetramethyl 1 aza 2 silacyclopentane 18 45 g 129 0 mmoles was dissolved in 125 ml of dry ether and placed in a 250 ml three necked flask fitted with a magnetic stir bar nitrogen inlet thermometer and a dropping funnel the reaction mixture was stirred and cooled to 0 u00b0 c using a dry magnetic ice isopropanol bath to this stirred mixture 10 0 g 64 5 mmoles of succinyl chloride dissolved in 35 ml of dry ether was added dropwise after the addition of succinyl chloride was over the mixture was stirred for an additional 1 hr solvent was removed under reduced pressure and the isolated product clsi me 2 ch 2 ch ch 3 ch 2 n ch 3 coch 2 2 was characterized by 1 h hmr and ir the reaction of 1 2 2 4 tetramethyl 1 aza 2 silacyclopentane and suberoyl chloride was carried out in a similar manner as that for the reaction with succinyl chloride in example 6 except that an ice water bath was used instead of the dry ice isopropanol bath in this case 10 0 g 69 9 mmoles of 1 2 2 4 tetramethyl 1 aza 2 silacyclopentane and 7 38 g 35 0 mmoles of suberoyl chloride was used chlorosilane i e 3i9 2 g 1 37 moles n methyl n 2 methyl 3 chlorodimethylsilyl propyl 2propenamide.