Claims
- 1. A process for preparing 2-alkynoic esters of the general formula (I),
- R.sup.1 --O--CO--C--C--R.sup.2 (I)
- in which R.sup.1 and R.sup.2 independently are C.sub.1-12 -alkyl, C.sub.6-12 -aryl, C.sub.7-12 -aralkyl or C.sub.7-12 and R.sup.2 can also be hydrogen, by reacting a chloroformate of the general formula (II),
- R.sup.1 --O--CO--Cl (II)
- in which R.sup.1 has the above meaning, with an alkylne of the general formula (III),
- R.sup.2 --C--C--H (III)
- in which R.sup.2 has the above meaning, in the presence of a Pt and/or Pd complex, which has phosphine ligands and/or phosphite ligands, as catalyst.
- 2. A process as claimed in claim 1, wherein R.sup.2 is hydrogen, a C.sub.1-16 -alkyl or a phenyl radical.
- 3. A process as claimed in claim 1, wherein R.sup.1 is lineaar C.sub.1-16 -alkyl radical.
- 4. A process as claimed in claim 1, wherein the reaction is carried out in the presence of at least one base.
- 5. A process as claimed in claim 4, wherein a stoichiometric amount of at least one sterically hindered amine is employed as base.
- 6. A process as claimed in claim 1, wherein the Pd complex is a Pd(0) and/or Pd(II) complex having organic phosphine or phosphite ligands.
- 7. A process as claimed in claim 1, wherein the catalyst is formed in situ during the reaction.
- 8. A process as claimed in claim 1, wherein the catalyst employed is tetrakis(triphenylphosphine)palladium(0).
- 9. A process as claimed in claim 1, wherein the Pd complex is a Pd(0) and/or Pd(II) complex having triarylphosphine ligands in which the aryl radicals can independently be substituted by Clan alkyl groups.
Priority Claims (1)
Number |
Date |
Country |
Kind |
197 15 697 |
Apr 1997 |
DEX |
|
Parent Case Info
This application is a 371 of PCT/EP98/02021 filed Apr. 7, 1998.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/EP98/02021 |
4/7/1998 |
|
|
10/13/1999 |
10/13/1999 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO98/46555 |
10/22/1998 |
|
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
871888 |
May 1979 |
BEX |
56-097250 |
Aug 1981 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Yamamoto et al., J. Am. Chem. Soc., 103, 1981, 6133-6136. |