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BLM concentrations was suggested by the reversal of this trend upon aeration of the reaction mixtures.The demonstration that a synthetic dodecanucleotide can act as a sequence-selective substrate for BLM provides a powerful new tool for the study of this antitumor antibiotic at its putative therapeutic locus and a novel approach for the study of naturally occurring and synthetic DNA interactive agents. Acknowledgment.We report herein novel photochemistry of [(acyloxy)methyl]-benzyldimethylsilanes as well as benzyltrimethylsilane.* The results provide not only definitive evidence for the formation of a benzyl radical-silyl radical pair in the primary photochemical process but also an important insight into the detailed mechanism for free-radical 1,2 (C -Si) acyloxy migration found r e~e n t l y .~

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