For vinyl and cis content in polymer
B, a spread of 1.470 and average deviation of O.5Y0 were obtained. These large deviations were probably caused by two factors. First, the solution concentrations were only 10 grams per liter as compared with 25 grams per liter for the other polymers. A proportionately larger error in concentration may be expected. Second, the correction for overlap of vinyl addition in the cis region is large, so that errors in measuring the vinyl concentration will affect the cis determination to an appreciable extent. It is difficult to determine the accuracy of this method, because of the assumptions which were made. If these assumptions are valid, however, then the accuracy will depend to a great extent on the accuracy with which the overlap coefficients were determined. It is felt that, with the single exception of the overlap coefficient for 1,2 addition of the cis band, the possible inaccuracy in the overlap coefficients will change the distributions by only 1 to 2%. For polymers containing small amounts of 1,2 addition (
