98 II. DIGESTION AND ABSORPTION OF FATS 



Table 12 {continued) 



Number Coordi- 



of nation 



Acholic component carbons'' M.p., °C. number 



Hydrocarbons, saturated: 



Dichloro-ethylene" 2 — 2 



Hexamethylethane*' 4,4 d 



Undecane* 11 183 6 



Dodecane" 12 186-187 p (?) 



Pentadecane 9 15 189.5-190 8 



Hexadecane 16 192-193" 8 ff 



Pentatriacontane* 35 201 .5 8 



Tritetracontane* 43 ca. 201 8 



Hydrocarbons, unsaturated: 



Cetene' 16 190 8 



A 13 -Heptacosene« 27 195.5-196.5 8 



Ketones: 



Acetone" 3 160-162 1 



Acetyl acetone' 5 162 3 



° Most of the data are adapted from H. Sobotka, The Chemistry of the Sterids. Williams 

 and Wilkins, Baltimore.. 1938, p. 112. 



6 Where more than one number is listed, the numerals represent the numbers of car- 

 bons in each branched chain. The value for the main carbon chain is listed last. 



c H. Wieland and H. Sorge, Z. physiol. Chem., 97, 1-26 (1916). 



d No choleic acid formed. 



• E. Vahlen, Z. physiol. Chem., 23, 99-108 (1897). 



f H. Sobotka and A. Goldberg, Biochem. J., 26, 555-568 (1932). 



" H. Sobotka and A. Goldberg, Biochem. J., 26, 905-909 (1932). 



h Not prepared. 



»' H. Rheinboldt, H. Pieper, and P. Zervas, Ann., 451, 256-273 (1927). 



' E. Chargaff and G. Abel, Biochem. J., 28, 1901-1906 (1934). 



k W. Marx and H. Sobotka, /. Org. Chem., 1, 275-279 (1936). 



' N. P. Buu-Hoi, Z. physiol. Chem., 278, 230-235 (1943). 



m By diagram only. 



" H". Reinboldt, O. Konig, and R. Often, Ann., 473, 249-259 (1929). 



° A. W. Downie, L. Stent, and S. M. White, Brit. J. Exptl. Pathol, 12, 1-9 (1931 ). 



" L. F. Fieser and M. S. Newman, J. Am. Chem. Soc., 57, 1602-1604 (1935). 



« H. Rheinboldt, P. Braun, E. Flume, O. Konig, and A. Lauber, ./. prakt. Chem., 153, 

 313-336 (1939). 



r H. Sobotka and J. Kahn, Biochem. ./., 26, 898-904 (1932). 



However, such a regular proportionality has not been found to exist in the 

 extensive studies summarized in Tables 12 and 13. Only those coordina- 

 tion numbers could be verified in the choleic acids investigated which had 

 previously been recognized as fitting in with the general structural arrange- 

 ment of inorganic coordination compounds according to the work of Werner. 

 The number of units must be such that a symmetrical arrangement can 

 obtain around a pivotal atom, molecule, or ion. In the case of inorganic 

 coordination compounds, the numbers most commonly encountered are 

 4, 6, and 8, although 2 or 3 may occasionally occur. There is no way in 



