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Struktur und Reaktivität von Bis(π‐pentamethylcyclopentadienyl)‐(2‐methyliden)titanacyclobutan
Author(s) -
Beckhaus Rüdiger,
Flatau Sabine,
Trojanov Sergej,
Hofmann Peter
Publication year - 1992
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19921250204
Subject(s) - chemistry , reactivity (psychology) , fragmentation (computing) , derivative (finance) , ethylene , medicinal chemistry , molar ratio , computational chemistry , organic chemistry , medicine , alternative medicine , pathology , computer science , financial economics , economics , catalysis , operating system
Structure and Reactivity of Bis(π‐pentamethylcyclopentadienyl)(2‐methylidene)titanacyclobutane The reaction of vinyllithium with bis(π‐pentamethylcyclopentadienyl)titanium dichloride in a molar ratio of 2:1 quantitatively yields the unexpected titanacyclobutane derivative ( 2 ) (Cp* = [C 5 (CH 3 ) 5 ]). The isolated complex 2 has been characterized by spectroscopic methods and by elemental analysis, and its structure has been confirmed by an X‐ray structure determination. The chemical reactivity of 2 is characterized by the splitting of the four‐membered ring at higher temperatures, forming a titanocene vinylidene fragment {Cp 2 *Ti = C = CH 2 } and ethylene. This cycloreversion is confirmed by the fragmentation behavior in the mass spectrometer, and some aspects of it have been studied by Extended Hückel Model calculations.