Crystallisation at pressure overcomes the effect of isotopic polymorphism in methylpyridine pentachlorophenol co-crystal. Though hydrogenated Cc polymorph can only be obtained pressure, it is stable on recovery to ambient conditions.

Calcium salts of analogues of dipicolinic acid were substituted for calcium dipicolinate in tests of germination of spores of Bacillus megaferium ATCC 10778. Only 4Hpyran-2,6-dicarboxylic acid was as active as dipicolinic acid. 3-Methyldipicolinic acid and 4-methyl-4H-pyran-2, B-dicarboxylic acid were active but the germination proceeded less rapidly. In the presence of a threshold concentratio...