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公开(公告)号：DE3135280A1
公开(公告)日：1983-03-24
申请号：DE3135280
申请日：1981-09-05
Applicant: BASF AG
Inventor： ECKHARDT HEINZ DIPL CHEM DR , HALBRITTER KLAUS DIPL CHEM DR , KAIBEL GERD DIPL ING , HARTMANN HORST
Abstract: Isolation of methanol-free, or practically methanol-free, methyl formate from its mixtures with methanol, by subjecting these mixtures to an extractive distillation using a liquid, polyhydric alcohol and separating off the methanol-free methyl formate as the top fraction of this distillation.
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公开(公告)号：DE3145709A1
公开(公告)日：1983-05-26
申请号：DE3145709
申请日：1981-11-19
Applicant: BASF AG
IPC: C07C41/54 , B01J27/00 , C07B61/00 , C07C41/00 , C07C41/50 , C07C43/303 , C07C67/00 , C07D317/12 , C07D317/22
Abstract: Novel malondialdehyde tetraalkylacetals and the preparation of malondialdehyde tetraalkylacetals by reacting alkyl formates, oxiranes and alkyl vinyl ethers in the presence of a halide of boron, antimony(V), iron(III), tin(II or IV) and/or zinc. The malondialdehyde tetraalkylacetals obtainable by the process of the invention are valuable starting materials for the preparation of dyes, pest control agents and pharmaceuticals.
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公开(公告)号：DE3123165A1
公开(公告)日：1983-01-05
申请号：DE3123165
申请日：1981-06-11
Applicant: BASF AG
IPC: B01J27/00 , C07B61/00 , C07D317/34
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公开(公告)号：DE3219541A1
公开(公告)日：1983-12-01
申请号：DE3219541
申请日：1982-05-25
Applicant: BASF AG
IPC: C07C43/30 , B01J21/00 , B01J23/00 , B01J27/00 , B01J31/00 , C07B61/00 , C07C29/10 , C07C41/00 , C07C41/50 , C07C41/60 , C07C43/303 , C07C43/32 , C07C67/00
Abstract: Process for the preparation of trialkyl orthoformates by reacting 2-alkoxy-(1,3)-dioxolanes with alkanols in the presence of acids and/or halides of elements from group IIb, IIIa, IVb, Va of the Periodic System and/or of iron, tin or silicon as catalysts. The orthoformates which can be prepared by the process of the invention are valuable starting substances for the preparation of crop protection agents and pharmaceuticals.
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