Thiocarbonyls, (pentafluoropheny1)-/ Sulfine / Pentafluorothiobenzaldehyde anthracene adduct (Pentafluoropheny1)thiocarbonyl Compounds, Synthesis and Structure of Pentafluorophenyl Phenyl Sulfine The C,F,-substituted thiocarbonyls C6F5-CS-R [R = C6H5 (Z), CH3 (4)] are synthesized from the corresponding carbonyl compounds by using in situ formed B2S3 The corresponding highly reactive thioaldehyde (R = H) is trapped with anthracene as Diels-Alder adduct 7. By oxidation of 2 sulfine 10 is generated which dimerizes in the crystal lattice. An X-ray crystal structure determination of a trithiaphosphinane 9 was carried out for the first time. The bis-para-substituted compound 12 is obtained from perfluorobenzophenone and hydrazine hydrate in a fast reaction. Das Strukturelement (F5C6)C(S)-ist bisher unbekannt. Im Zuge unserer Studien von teil-und perhalogenierten CSungesattigten Verbind~ngen[~,~], welche auch als Synthesebausteine fur schwefelhaltige Heterocyclen eine wichtige Rolle spielen, interessierte uns, inwieweit die desaktivierten Carbonylverbindungen mit einem oder zwei Pentafluorphenyl-Substituenten in ihre Thioanaloga uberfuhrbar sind. Er-fahrungsgemaD sinkt die Stabilitat von Thiocarbonylverbindungen in der Reihe: