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A new protocol for Cu(TFA)2-catalyzed picolinamido-directed C8-H cyanation of naphthalene derivatives with benzoyl cyanide as cyano source was developed. A series of 8-cyano-1-(picolinamido)naphthalene derivatives were facilely and conveniently obtained in moderate to good yields by using this method. There were 10 new compounds in the synthesized 22 cyanide products. In this reaction, benzoyl cyanide as cyano source was originally employed to the C(sp2)-H cyanation of the arenes, and the picolinamide moiety as the directing group played a critical role in cyanation of naphthalenes.

A bidentate-chelation assistant palladium-catalyzed direct C-H cyanation of picolinamides with TMSCN is described. The reaction of various derivatives gave the corresponding cyanated products in moderate to good yields under mild conditions. In addition, the cyanated product could transform into some valuable functional groups in good yields. Copyright © 2016 John Wiley & Sons, Ltd.

A T300 carbon fiber and a SiC-coated C/SiC composite made from the same fiber were studied in atomic oxygen environment. The carbon fiber shows significant degradation while the erosion rate of SiC-coating of C/SiC is about 50 times lower. Evidence shows that Si is preferentially etched from the SiC surface. And XPS information showed that amorphous carbon and diamond-like carbonare periodically generated on the tested composite surface. Statistical analysis shows that the C/SiC specimens have no significant change in flexural properties after 1-year fluence AO treatment.