and 50% ethanol. Bicyclo[3.3.0]octane was isolated from this mixture by using preparative v.p.c. through a 6-ft. silicone oil D.C. 200 (dimethylsiloxane polymer) column at 126°. The sample showed infrared bands at 3.5, 6.9, 7.4, 7.5, 7.6, 8.1, 10.0, and 11.0m and the spectrum was identical with the literature spectrum of bicyclo [3.3.0] octane .6The n.m.r. spectrum (Figure 4) was identical with the literature spectrum of bicyclo[3.3.0]octane.6

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synopsisA study of the proton magnetic resonance spectra of poIy(viny1 chloride) (PVC), poly(vinylidene chloride) (PVDC), and vinyl chloride-vinylidene chloride (VGVDC) copolymer has resulted in a clearer understanding of the copolymer NMR spectra. Comparison of the homopolymer spectra with the copolymer spectra, including information obtained from decoupling experiments, indicated that the chain structure of the eight copolymers studied were of two different types. The simplest type copolymer chain contained head-to-tail VDC sequences, head-to-head or tail-to-tail VDC sequences, and VGVDC sequences. The second type copolymer contained all of the sequences of type I Copolymers and, in addition, contained VC sequences. The average length of these VC sequences was less than four VC units. The composition of seven of the copolymers waa determined by chlorine analysis and by an NMR method of analysis which waa based on the above conclusions: The agreement between the results of the two methods of analysis was quite good.

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