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- W4236025090 abstract "An O-methylated low-volatile bituminous coal, PSOC 1197, was treated repetitively with a series of carbanion bases and then quenched with 13,14C double-labeled methyl iodide. The extent of methylation depended upon the identity of the base and increased in the order 9-phenylfluorenyllithium ≪ fluorenyllithium ~ trityllithium. A significant number of methyl groups (0.7 per 100 coal carbons) was introduced by using fluorenyllithium and trityllithium, but the coal was relatively unreactive toward methylation when 9-phenylfluorenyllithium was the base. Additional methyl groups could be introduced after repetitive treatments. This result and the cross-polarization/magic angle spinning 13C NMR spectra of the coal derivatives obtained by using fluorenyllithium as base indicate the reaction of acidic -CH2- and -C(H)R- sites. On the basis of these results, PSOC 1197 could contain a significant number (0.7-1.9 per 100 coal carbons) of fluorene-like structural units." @default.
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- W4236025090 date "1987-12-22" @default.
- W4236025090 modified "2023-09-25" @default.
- W4236025090 title "Selective Methylation of Hydroaromatic C-H Sites in Coal" @default.
- W4236025090 doi "https://doi.org/10.1021/ba-1988-0217.ch015" @default.
- W4236025090 hasPublicationYear "1987" @default.
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