Siew-Kwong Kan

A 400 mhz 1H NMR study of the eight basic heteroyohimbine alkaloids

Abstract A 400 MHz 1 H NMR study of the eight basic heteroyohimbine alkaloids has permitted the chemical shifts of all the protons to be established and most of the main coupling constants to be determined. A conformational study of the heteroyohimbine structures is presented.

Determination de structures par RMN du 1H A 400 MHz: Quatre nouveaux alcaloides de Tabernaemontana albiflora

Resume The structures of four new alkaloids 1 – 4 of the 21-nor (+) pandolane type from the stem bark of Tabernaemontana albiflora (Miq.) Pull. (Apocynaceae) have been determined.

Determination de structures par RMN du 1H A 400 MH : Alcaloides de .

Abstract The structures of two new alkaloids of the 21-nor (+) pandolane type from the bark of Tabernaemontana albiflora (Miq.) Pull. (Apocynaceae), were determined.

Determination de structures par RMN du 1H A 400 MHz: Quatre nouveaux alcaloides de

Resume The structures of four new alkaloids 1 – 4 of the 21-nor (+) pandolane type from the stem bark of Tabernaemontana albiflora (Miq.) Pull. (Apocynaceae) have been determined.

Structure determination using 1H nuclear magnetic resonance at 400 mhz: four new alkaloids from Tabernaemontana albiflora.

Resume The structures of four new alkaloids 1 – 4 of the 21-nor (+) pandolane type from the stem bark of Tabernaemontana albiflora (Miq.) Pull. (Apocynaceae) have been determined.

Structural determination by NMR of 1H at 400 MHz: alkaloids of Tabernaemontana albiflora.

Abstract The structures of two new alkaloids of the 21-nor (+) pandolane type from the bark of Tabernaemontana albiflora (Miq.) Pull. (Apocynaceae), were determined.