272 111. CHEMISTRY OF NEUTRAL FATS 



Table 37 

 Melting Points and Specific Rotations of Some Optically Active (a) 



MONOGLYCERIDES" 

 Monoglyceride M.p., °C. [ajo Solvent 



Z( - )-a-Monobutyrin '' -6.0° Pyridine 



-2.2° H.S/ 



d{ + )-a-Monobutyrin '' +2.2° H.S/ 



l{ — )-a-Monolaurin 53-5-4 -3 . 7(i° Pyridine 



l( - )-a-Monopalmitin 71-72 -4 . 37° Pyridine 



;( - )-a-Monostearin 76-77 -3.58° Pyridine 



" Adapted from H. O. L. Fischer and E. Baer, Chem. Revs., 29, 287-316 (1941). 

 '' Liquid. "^ H. S. = homogeneous substance. 



Table 38 

 Boiling or Melting Points, Refractive Indices, and Specific Rotations of Some 



a-MoNOGLYCERlDE DERIVATIVES" 



a-Monoglyceride B.p. or M.p., 



deriv. °C. n*" [ajo'' Solvent": 



Acetone compd. of: 

 K - )-a-acetylglycerol 85-86 1.4288'*° +3.24 H, S. 



(10-11 mm.) 

 Z( _ ).«.pi.opionylglycerol 88-89 1.42602«° +3.6 H. S. 



(7 mm.) 

 (/(+)-a-propionylglycerol 88-89 1.426924° -3.6 H. S. 



(7 mm.) 

 i( - )-a-butyrylglycerol 97-98.5 1.4270'*° +4.92 H. S. 



(7 mm.) 

 d( + )-a-butyrylglycerol 97-99 1.4280"° -4.9 H. S. 



(7 mm.) 

 ^( _ ).a.caprovlglycerol 118-120 1.4322'**° +4.5 H. S. 



(7 mm.) 

 d( + )-a-caproylglycerol 118-120 1.43492"° -4.5 H. S. 



(7 mm.) 

 Z( - )-a-laurylglycerol 130-131 1.4448'"° +3.42"° H. S. 



(0.002 mm.) 

 /( - )-a-pahnitylglycerol 33-35 — +2.48 P 



;( _ ).«-stearylglycerol 43.5 — +1.9 P 



l{ — )-a-(p-toluene sulfonyl)- 



glycerol 63-64 — —7.3 P 



Z( - )-a-(p-nitrobenzoyl)glyceroi 88-89 — -17.1 Et 



« Adapted from H. O. L. Fischer and E. Baer, C/ie»t. Revs., 29, 287-316 (1941). 



'" Superscript figures represent temperature (°C.). 



■: H. S. = homogeneous substance; P = pyridine; Et = ethanol. 



diglycerides.3^8 Finally, Griin and co-workers'^^ obtained highly active 

 strychnine salts of the sulfuric acid esters, but were unable to obtain any 

 optically active product after removal of the sulfuric acid. 



An entirely different principle for the preparation of the optical antip- 



3«8 M. Bergmann, E. Brand, and F. Dreyer, Ber., 5/^, 936-965 (1921). 

 3M A. Griin and R. Limpiicher, Ber., 60, 255-265 (1927). 



