... Tetrahedron Letters. Volume 51, Issue 6, 10 February 2010, Pages 924–927. Cover image Cover image. ... In this Letter, we report that Ni(COD) 2 /4-ClC 6 H 4 COR (R = H, CH 3 , Ph) catalyst system could efficiently catalyze the addition reactions of arylboroxines with aldehydes. ...