Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， category: catalyst-ligand, Which mentioned a new discovery about 1271-19-8
The preparation of carbocyclic and heterocyclic compounds by the low-valent titanium species-promoted intramolecular reactions of thioacetals was studied. The cyclization of thioacetals having an olefin moiety proceeded With the loss of terminal olefin carbon to produce the corresponding five-, six-, and seven-membered cycloalkenes when they were treated with the low-valent titanium species Cp2Ti[P(OEt)3]2. This method has been successfully applied to the syntheses of cyclic unsaturated amines and ethers. When S-[3,3-bis(phenylthio)propyl] thioalkanoates were treated with the low-valent titanium species, the intramolecular carbonyl olefination Proceeded to produce 5-substituted 2,3-dihydrothiophenes. (C) 2000 Elsevier Science Ltd All rights reserved.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI