McLeod—The Walden Inversion—A Critical Review. 521 
7. Conv. of acrylic acid into hydracrylic by heating at 100° with 
aqueous sodium hydroxide. Linnemann: Ann. 191, 304. LJn- 
nemann: Ber. 8, 1095. Erlenmeyer: Ann. 191, 267. 
8 . Action of ammonia on Beta iodpropionic acid. Heintz: Ann. 
156, 25. 
9. Action of lime-water at 100° on ethylene iodpropionic Beta iod¬ 
propionic acid). Heintz: Ann. 157, 295. 
10. Splendid method for preparation of pure acrylic ethyl ester by 
action of zinc on Beta dibrompropionic ethyl ester. Caspary 
and Tollens: Ann. 167, 222-270. 
II. Monochloracetic, glycollic, etc. 
1. Prep, of thioglycollic and thiodiglycollic ester by action of so¬ 
dium hydrosulphide on monochloracetic ester. Lossen: Ann. 
136, 244. 
2. Formation of glycollic from acetic through the action of moist 
silver oxide on monochloracetic acid. Kekule: Ann. 105, 288. 
3. Action of various bases on monochloracetic acid. Hoffmann: 
Ann. 102, 6. 
4. ‘Zur Kenntnis der glycolamidsauren’. Heintz: Ann. 136, 213- 
223. 
III. Lactyllactic, lactid and Tiomologues. 
1. Prep, of cryst. lactid by passing an air-stream through dl lactic 
at 150°. Wislicenius: Ann. 167, 318-319. 
2. Prep, of lactid and of glycolid by dry distillation of sodium salts 
of brom fatty acids in vacuum. Bischoff and Walden: Ber. 
26, 263. 
3. Prep, and prop, of lactyl lactyl lactic and dl dilactid. Jung- 
fleish and Godchot: Comptes Rendus 140, 502-5. 
4. Condensation of pyruvic acid by boiling with aqueous barium 
hydroxide. Bottinger: Ann. 208, 129. 
5. Prep, of lactyl lactic (lactic anhydride). Pelouze: Ann. 53, 112- 
124. Wislicenus: Ann. 133, 257; Ann. 164, 181, etc. 
6 . Prep, of lactyl lactic ethyl ester. Jungfleish and Godchot: C. R. 
144, 425-7. 
7. Prep, of opt. active dilactid. Jungfleish and Godchot: C. R. 141, 
111-113. 
IV. a chlor-, brom, hydroxy, amino propionic acids. 
1. Resolution of dl brompropionic acid using cinchonin. Warburg: 
Ann. 340, 168. Ramberg: Ann. 349, 324>; Ber. 33, 3254; Ber. 23, 
3354. 
2. Resolution of dl alanin by partial fermentation with yeast. 
Felix Ehrlich: Bioch. Zeit. 1. 8-31. Ber. 39, 3992 footnote. 
