The structure of pithecolobine

Wiesner, K.; Orr, D. E.

doi:10.1016/s0040-4039(01)99334-7

Cited by 12 publications

(8 citation statements)

References 4 publications

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“…Since that time we have solved the structure in principle (2,3) and corroborated the solution by synthetic work (4). All this has been published only in preliminary form.…”

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confidence: 65%

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Structure of pithecolobine. II

Wiesner¹,

Macdonald²,

Bankiewicz³

et al. 1968

Can. J. Chem.

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“…Since that time we have solved the structure in principle (2,3) and corroborated the solution by synthetic work (4). All this has been published only in preliminary form.…”

mentioning

confidence: 65%

“…In order to corroborate the structure of desoxypithecolobine we have synthesized the tetratosylate of the macrocyclic amine (9b) (4). Since we were unable to detosylate the synthetic material, we prepared the tetratosylate of "natural" desoxypithecolobine and compared it with the synthetic one.…”

Section: (8)mentioning

confidence: 99%

Structure of pithecolobine. II

Wiesner¹,

Macdonald²,

Bankiewicz³

et al. 1968

Can. J. Chem.

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“…in the formation of radiation-induced reactions and modifications resulting from radiationinduced crosslinking which are most important from the industrial viewpoint. 1 By crosslinking a polymer such as polyethylene, a three-dimensional network structure is formed which increases the molecular weight and changes the material from a thermoplastic to a thermoset. 2 In this regard, crosslinking of polyethylene improves desirable properties of toughness, flexibility, impact, and chemical and solvent resistance and modifies their mechanical strength and thermal properties.…”

Section: Introduction E Lectron Beam Modification Of Polymers Resultsmentioning

confidence: 99%

“…The addition of selected compounds that may promote better miscibility increases the crosslinking homogeneity of irradiated polymer blends as described in the literature. 1,2,5,6 A thermoplastic resin composition comprising 50-85 parts by weight of an ethylene-vinyl alcohol copolymer and 10-40 parts by weight of an ionomer of ethylene-unsaturated carboxylic acid (methacrylic acid) copolymer are provided. The resin composition is excellent in impact resistance, stretchability, drawability, and transparency and is preferably used for packaging material.…”

Section: Introduction E Lectron Beam Modification Of Polymers Resultsmentioning

confidence: 99%

Effect of metal salt of ethylene/methacrylic acid copolymer on electron beam crosslinking of low density polyethylene

Ali¹,

Legocka

2005

Adv Polym Technol

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ABSTRACT:A thermoplastic resin based on ethylene/methacrylic acid copolymer (EMA) was used as a modifier for different low density polyethylene (LDPE) batches under the effect of electron beam irradiation. The EMA resin was used in the zinc metal form at a constant ratio of 9 wt% in all preparations. The effect of EMA resin as a crosslinking agent was characterized by percentage gel fraction, tensile mechanical, and differential scanning calorimetry (DSC). In this study, the maximum gel content (G max ) and gelling dose (D gel ) parameters were determined by applying the familiar Charlesby-Pinner relationship. The results showed that the gel content for all investigated samples gradually increases with increasing irradiation dose. The modified LDPE batches with EMA show higher gel content than unmodified ones at any irradiation dose. Also, the gel content of all LDPE composites decreases as a result of post-storage effect. The mechanical properties (tensile strength and elongation at break) exhibit significant change as a result of irradiation and blending the LDPE batch with EMA. The level of

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“…Pithecelobium saman contains pithecelobine, an alkaloid of unusual structure (Wiesner, 1960) having pharmacological properties (Leonard & Sherrat, 1961 similar to those of extracts of P . multijlorum.…”

Section: Discussionmentioning

confidence: 99%

Pharmacological screening of some Brazilian plants

Barros

Matos

Vieira

et al. 1970

Journal of Pharmacy and Pharmacology

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Forty‐five species of plants from several botanical families growing in North East Brazil have been examined for toxicity on mice and small fishes, cat blood pressure and respiration, isolated toad heart and rectus abdominis muscle, guinea‐pig ileum, rabbit duodenum and rat uterus. A high toxicity to mice and fishes was exhibited by aqueous (A) and ethanolic (B) extracts from Luffa operculata, Peschiera affinis, Pithecelobium multiflorum (gall) and Zizyphus joazeiro and by extract B from Pithecelobium multiflorum (stembark). Cardiorespiratory activity was shown by Annona squamosa, Byrsonima sericea, Crataeva tapia, Erythrina velutina, Fagara rhoifolia, Operculina macrocarpa, Perschiera affinis, Pithecelobium multiflorum, Spondias lutea and Zizyphus joazeiro. Extracts A and B from Operculina macrocarpa and Pithecelobium multiflorum, extract A from Luffa operculata and Zizyphus joazeiro and extract B from Crataeva tapia and Peschiera affinis promoted a contraction of the toad rectus abdominis muscle. Both extracts from Annona aquamosa and Fagara rhoifolia (leaf) provoked a spasmogenic effect on guineapig ileum and a spasmolytic one on rabbit duodenum. Extracts A and B from Pithecelobium multiflorum, Vitex gardneriana and Zizyphus joazeiro exhibited a spasmogenic activity on both preparations, while extracts A and B from Peschiera affinis and extract B from Erythrina velutina also evidenced a spasmolytic activity on both preparations. Oxytocic activity was shown by both extracts from Annona squamosa, Byrsonima sericea, Pithecelobium multiflorum and Vitex gardneriana.

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The structure of pithecolobine

Cited by 12 publications

References 4 publications

Structure of pithecolobine. II

Structure of pithecolobine. II

Effect of metal salt of ethylene/methacrylic acid copolymer on electron beam crosslinking of low density polyethylene

Pharmacological screening of some Brazilian plants

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