Errata Volume 72B,1975 Page 90 The caption to formula (4)b in Scheme 3 should read “R =C2H5C(CH3)3”. Page 92 The first part of the sentence beginning on the sixth line below scheme 7 should read “if the reaction has no memory then the ratio [(CH3),C-]/3[(CD3),C*]in experiment (i) should equal 3[(CH3),C-]/[(CD,),C*] in experiment (ii) . . . ”. Page 269 line 7 The authors of ref. 117(b) point out that the statement that “. . . (119) reacts with sodium sulphinate and with potassium cyanide to give disulphone (120) (64%) and 2-cyanopyridine (87%) respectively.” is incorrect. Although (119)does react with potassium cyanide as indicated it does not react with sodium sulphinate. It is the 4-chloro- 1-pyridiniopyridinium salt which reacts with sodium benzenesulphinate to give the disulphone (120) in 64% yield. 429