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• W2043969969 abstract "Abstract Pentacarbonyl(pentamethylenevinylidene)chromium, [(CO) 5 CrCC(CH 2 ) 5 ] ( 1 ), reacts with 1‐methylthio‐1‐propyne ( 2a ) and N ‐(1‐propynyl)phenothiazine ( 2b ) by regio‐specific addition of the CC bond of the alkyne to the CC bond of the vinylidene ligand of 1 . Initially, complexes with a spirocyclic cyclobutenylidene ligand are formed, [(CO) 5 Cr (CH 2 ) 5 ] ( 3 ) and [(CO) 5 ‐Cr (CH 2 ) 5 ] ( 10 ). Subsequent thermally initiated ring expansion affords the 2‐methyl‐4,5,6,7‐tetrahydroindenyl(methyl)thioether complex [(CO) 5 ‐Cr–S(Me)(Me‐C 9 H 10 )] ( 4 ) and the N ‐(2‐methyl‐4,5,6,7‐tetrahydroindenyl)phenothiazine complex [(CO) 5 Cr–S(C 6 H 4 ) 2 ‐N–(Me‐C 9 H 10 )] ( 11 ), respectively. In both complexes, 4 and 11 the ligand is coordinated to the metal via the sulfur atom. The constitutions were established by (H,H)‐, (H,C)‐ and NOE‐correlated NMR spectroscopy. In the reaction of 1 with 2a , in addition to 3 and 4 , the methyl(propynyl)thioether complex [(CO) 5 Cr–S(Me)CCMe] ( 5 ) was formed. An isolable 3‐methylthio‐substituted cyclobutenylidene complex, [(CO) 5 Cr Ph 2 ] ( 9 ) was obtained from [(CO) 5 CrCCPh 2 ] ( 8 ) and 2a . The 4,5,6,7‐tetrahydroindenylthioether ligand of 11 was cleaved from the metal by exposure of 11 adsorbed on silica gel to air or by treatment of 11 with [NEt 4 ]Br in dichloromethane." @default.
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• W2043969969 date "1996-06-01" @default.
• W2043969969 modified "2023-10-18" @default.
• W2043969969 title "Ring Expansion of Spirocyclic Cyclobutenylidene Ligands in Pentacarbonylchromium Complexes to Tetrahydroindene Derivatives" @default.
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• W2043969969 doi "https://doi.org/10.1002/cber.19961290605" @default.
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