AmsJeJt.?i893arm*}  Benzylidine  Dipiperidine.  429 
Benzylidine  Dipiperidine. — No  difficulty  was  experienced  in  pre- 
paring this  compound  according  to  the  method  given  last  year  in 
the  "  Proceedings  of  the  Wisconsin  Pharmaceutical  Association  "  of 
1892,  p.  84.  Since  the  synthesis  of  this  compound  was  so  readily 
effected  with  benzaldehyde  according  to  the  following  reaction  : 
XT  CH2\p|_r 
/H  \CH2 — CH2/  2 
C6H5C^{J 
11  iN\CH2— CH2/^n2 
It  seemed  desirable  to  effect  the  same  with  benzalchloride  in  the 
following  manner  : 
cur    „/ UH  \CH2_CH2/AH* 
5*3  grams  of  piperidine  are  added  to  a  solution  of  5  grams  of 
benzalchloride  in  10  grams  of  petroleum-ether.  The  solution  is 
heated  on  a  water-bath  in  a  flask  connected  with  an  inverted  con- 
denser for  15  minutes.  The  solution  is  then  filtered  and  set  aside 
in  a  crystallizing  dish.  The  yield  of  the  crystallized  product  is  very 
small,  and  is  evidently  the  hydrochlorate  of  benzylidine  dipiperidine 
as  is  shown  by  its  analysis. 
0-1700  grams  yielded  01 523  grams  AgCl  ==  0-03753  grams  CI. 
Calculated  for 
C17H26N2.2HC1  Found. 
21-40  p.  c.  22-07 
Benzylidine  dipiperidine  hydrochlorate  crystallizes  in  long  shin- 
ing needles,  having  a  melting  point  of  2500  C.  It  is  soluble  in 
alcohol,  chloroform  and  ether,  from  which  it  may  be  recrystallized. 
Owing  to  the  readiness  with  which  benzylidine  dipiperidine  decom- 
poses under  the  action  of  alkalies,  no  attempt  was  made  to  prepare 
the  free  base  from  this  salt. 
Platinum  Double  Salt. — On  p.  85,  "  Proceedings  of  the  Wisconsin 
Pharmaceutical  Association,"  of  1892,  it  will  be  seen  that  the  plati- 
num calculated  for  in  the  formula  C6H5CH-(NC5H10HCl)22PtCl4  is 
given  as  67-20  per  cent.,  while  that  obtained  was  67-55  Per  cent- 
This  evidently  is  a  mistake,  as  a  compound  of  the  above  formula 
