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Mono(tricarbonylchromium) complexes of dimesitylmethane (1), dimesityl ketone (2), 1,1-dimesitylethene (3), 2,6-dimethylphenyl mesityl ketone (with the mesityl ring complexed) (4), and dimesitylmethanol (5) are described. By nmr spectroscopy the barriers of rotation of the uncomplexed rings, complexes 1-5, were found to be (in kcal/mol) 14.3 at 18°, 19.6 at 118°, 14.2 at 14°, 19.4 at 115°, and 13.9 at 22°, respectively. The higher barriers for the ketone complexes are attributed to increased stabilization of the ground-state conformation of the ketone complexes by conjugation of the tt electrons of the uncomplexed ring with those of the carbonyl group. It is suggested that the approximately equal barrier for the methane (1) and ethene (3) complexes means that there is very little interaction berween the electrons of the uncomplexed ring and those of the carbon-carbon double bond. Also reported are the ir absorption bands for the carbonyl group of some aryl ketones and their tricarbony lchromium complexes. Results and DiscussionMono(tricarbonylchromium) complexes of dimesitylmethane (1), dimesityl ketone (2), 1,1-dimesitylethene

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The reaction of polyacrylamide with formaldehyde and bisulfite to produce the sulfomethylated amide has been the subject of some investigation? Owing t o the industrial applications for inexpensive polymeric sulfonates, a great deal of attention has been given to the utilization of products derived from this reaction?-4We have recently investigated this reaction in some detail using 13C-NMR and find that a variety of reactions take place in this system at alkaline pHs. There is no evidence for sulfomethylation of the amide taking place under conditions commonly thought to produce this addact. The major products formed at pH = 12 and 75°C are partially hydrolyzed polyacrylamide and the mono, bis, and tris sulfomethylamines.