Metacyclophane, synthesis thereof, and compositions stabilized thereby

摘要

1.1.1.1.!metacyclophane is a cyclic compound consisting of two alkane bisphenol molecules coupled through their available ortho positions by a methylene moiety. The cyclic compound is initially formed as a dihydrate by reaction of a 2,2'-di-substituted alkane bisphenol such as a 2,2'-di-t. butylated alkane bisphenol with paraformaldehyde at about 170° C. in an aromatic solvent. The dihydrate may be dehydrated under select conditions. The cyclic compound is an excellent antioxidant in mineral filled natural rubber, and in polyolefins, particularly in polypropylene.