ated : . this inxestizatibn, ‘it was proved more and more, in the authors’ 
oe cate 
nion, Sthiat i in 1 judging the relations between | the rotatory power and the chemical 
constitution the course of the rotatory dispersion curve, compared with the curve of 
it is all the more striking that the benzylidene derivative shows a fully regular curve 
as the wave-length characteristic of the methylene camphor derivatives. Rupe and 
Beeet CeCHOH | vo CH ren ans CH-CO.H 
| Cats | ee LGN, = GluC | | Bi ELS Loe ONS 
ee x Rr. 
Seti ses Hemetiytcnc di ay Nitrile of Bee (ILI) os 
> camphor. * _ acetic acid. acid (Methylenecamphor car- 
: oe aa $6.) boxylic acid). 
aie Se: CH- coc! lo 
5 ‘ se Hi | ae i he Nay C(CO2 Cs Hs)2 
eee Diethyl sodiomalorate. ——> VIII 
“dy CShphorttene act chloride. sree 
CBr: CH CG. 1. © SH: CHs: CO eC: CH-CO-0. COCH, 
bamc ft ; nye ae | Cs oun | 
4 _ (Vv) as of (V1) pe ay Mae (VII) ee anhydride of acetic © ; 
_camphorylidene acetic acid. (Methylcamphor carboxylic acid). _ and of camphoryl-3-acetic acids. 
9 Ene. CH-CO\ Need ey CICLO: CH, 
(Cott | € (CO2CsHa)s if Og Oh os ee 
¥ \¢co 9 7 
(VIN) LS ae ester. a (1X) Dei 
©, JG:CH-CO-CH:CH-CoHe Oe CHICO: CH:CHC ~SNO, 
y en Cek , | ee 
= (x) aa ; (XI) See lecteceiny ymca toe 
3 CoH ru | CHs CH; Cte -  c:CH-CocH, 
Ble CH. C:N-N-C°CH:C. , Chi, fas 
: (Xl) ‘Hydrazine derivative of camphorylidene-3-acetone. (XIIL) Mesityloxide. 
2 ER es iio fn’ CH CH COCH: 
CsAis NSS eae er Gs Cs Aya hia 
| CH-C=C-CHs 
HN ae ie . ( (XM) cap 3-aceton. 
(XIV) Possible formula of ‘the com- — CG Hu] | 
pound from camphorylidene acetone : 
$ and semicarbazide. i OSU Tie eee 
Wild*) ‘bdve shown in a previous publication that on conversion of a ketone into its 
benzylidene compound the rotatory power is influenced but scarcely, because the 
atom; yet a rotation amounting at least to that of the ketone might have been expected. 
The authors explain this fact provisionally by assuming that these unsaturated ketones 
are influenced strongly by the solvents. The hydrogenated compounds show all a 
decidedly lower rotatory power than the corresponding unsaturated ones. : 
= aa 7 : 7 ; a : ; { 
*) Liebig’s Annalen 414 (1917), 111. 
- e Pp 
ik 
159 
a ‘substance of the same class, but with normal dispersion, is alone authoritative. Yet 
( eH;CH: group, Otherwise very active, is too far distant from the asymmetric carbon | 
