| 摘要 |
1,212,479. Dialkenyl - tetrahydropyrans. SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ N.V. 27 Oct., 1969 [28 Oct., 1968], No. 52434/69. Heading C2C. [Also in Division A5] Dialkenyl - substituted tetrahydropyrans or a mixture of isomeric dialkenyl - substituted tetrahydropyrans are obtained by reacting two mols of a conjugated diolefin with one mol of formaldehyde in the presence of one or more complexes comprising zero-valent palladium and one or more tertiary phosphines. Examples are given for the production of the compounds. |
