Notes on scientific research. 143 



The same result is arrived at by starting from homoveratric aldehyde (obtained 

 by oxidation of methyleugenol), converting it into its oxime, and reducing the latter. 



Homoveratrylamine is combined with homoveratric acid chloride, producing an 

 amide which gives in the usual manner a dihydroisoquinoline derivative, i. e. dihydro- 

 papaverin. On reducing the latter one obtains a tetrahydro compound, i.e. d, Maudanosin 

 which can be split up into its optically active components. 



Hydrocarbons. 



The melting point of doubly unsaturated bodies with conjugated double bonds. — The 

 melting point of unsaturated acids which posess a double bond next to the carbonyl 

 group are a good deal higher than those of the corresponding saturated compounds. 

 Accordingly, heptatriene which has been recently prepared by C. J. Enklaar 1 ) has a 

 much higher melting point than heptane. Enklaar 2 ) also determined the melting point 

 of a series of other hydrocarbons, but a comparison with the corresponding saturated 

 hydrocarbons was not possible. The figures he found were the following: — 



congelation point: melting point: 



Isoprene about — 120° not sharply defined 



/?,7-dimethylbutadiene . below —65° — 65 to —55° 



«, a-dimethylbutadiene . about — 70° not scharply defined 



hexadiene 66° not scharply defined 



dihydromyrcene ... at low temperatures it becomes first sirupy and 



then glass like 

 dimethyl-^, 6-octane . . at low temperatures it becomes first sirupy and 



then glass like 



octatriene - — —90 to —85° 



nonatriene . . . . . does not become solid even at — 70° 



Investigations on ocimene and analogous hydrocarbons. — We have frequently had 

 occasion to discuss C. J. Enklaar's 3 ) publications on ocimene and similar hydrocarbons 

 and can now again report on researches of the same nature by this author 4 ). 



By ozonizing allo-ocimen 5 ) with the aid of ozone of 5 to 8 percent. 3 -content, 

 he obtained an ozonide which was almost completely soluble in water. The watery 

 solution contained traces of a substance which formed with phenylhydrazine a compound 

 melting at 230°. Apparently this substance is only obtained in the presence of ozone 

 of a high percentage and it is not a normal product of disintegration. This oxidation 

 certainly does not lead to trioxymethylene. DihydroaZZoocimene was also ozonized; 

 the watery solution of the decomposition-product only gave a slight pyrrole reaction; 

 acetone could not be detected, however, with certainty an aldehyde or ketone boiling 

 at about 80°. Nor had levulinic acid been formed. 



The watery solution of the ocimene ozonide which contained the non-volatile 

 products gave with zinc dust a strong pyrrole reaction. 



J ) Berl. Berichte 49 (1916), 211; Report October 1916, p. 117. — ») Recueil trao. chim. des P.-B. 36 (1916), 

 247. According to a separate impression kindly placed at our disposal. — 3 ) Comp. Report April 1906, 109; 

 October 1908, 153, April 1909, 119. — *) Recueil trav. chim. des P.-B. 36 (1916), 215. According to a separate 

 impression kindly placed at our disposal. — 5 ) Allooamene originates from ocimene hy applying heat. 



