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Prevalence and associated factors of selling sex among men who have sex with men (MSM) in Latin America: results from the Latin American MSM Internet Survey in 18 countries (LAMIS-2018). [PDF]

open access: yesBMJ Glob Health
Salazar M   +10 more
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FACILE SYNTHESIS OF 2-METHYLENE-4-BUTYROLACTONES

Chemistry Letters, 1986
Abstract 2-Methylene-4-butyrolactones were conveniently synthesized by treatment of an aldehyde with 2-carboethoxyallyl(-ic) bromide and metallic tin (and aluminum) in good yields. Protolichesterinic acid was synthesized by employing the method.
Junzo Nokami   +3 more
openaire   +1 more source

CLINICAL APPLICATION OF 4‐HYDROXYBUTYRATE SODIUM AND 4‐BUTYROLACTONE IN NEUROPSYCHIATRIC PATIENTS

Psychiatry and Clinical Neurosciences, 1966
Summary4‐hydroxybutyrate sodium (HB) and/or 4‐butyrolactone (BL) were applied orally or intravenously to 288 neuropsychiatric patients and 9 normal adults.The results obtained were as follows:1. In 9 normal adults to whom 1 to 8 gm of the drugs were administered, no serious changes were observed in respiration, heart rate, blood pressure and ...
Zenryu Tanaka   +8 more
openaire   +2 more sources

Palladium‐Catalyzed (5+3) Annulation of 4‐Vinyl‐4‐Butyrolactones with C,N‐Cyclic Azomethine Imines: Construction of Eight‐Membered Ring

Advanced Synthesis & Catalysis, 2022
AbstractIn this paper, we designed and synthesized 4‐vinyl‐4‐butyrolactone as a precursor to generate the zwitterionic allylpalladium intermediates, which behaved as five‐membered all‐carbon synthon in palladium‐catalyzed (5+3) annulation with azomethine imines, giving eight‐membered ring‐fused heterocycles (26 examples, 49% to 97% yield, >20:1 dr ...
Sen Yang   +7 more
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Preparation, properties and biodegradation of stereoregular copolymers of (R,S)-3-butyrolactone and 4-butyrolactone

Macromolecular Chemistry and Physics, 1998
Copolymers obtained from the copolymerization of (R,S)-3-butyrolactone ((R,S)-3-BL) and 4-butyrolactone (4-BL) catalyzed by isobutylaluminoxane were compared in structure and properties to copolymers having the same types of repeating units produced by Alcaligenes eutrophus when grown with an appropriate substrate or substrate mixtures. Copolymers with
Bin Wu   +2 more
openaire   +1 more source

Molecular dynamics and ionic associations of lithium hexafluoroarsenate (LiAsF6) in 4-butyrolactone mixtures with 2-methyltetrahydrofuran

The Journal of Physical Chemistry, 1985
Solutions of LiAsF/sub 6/ at 298.2 K were studied by audiofrequency conductance in the concentration range 10/sup -4/-10/sup -2/ mol dm/sup -3/ and by radiofrequency ultrasonic absorption in the concentration range 0.05-0.5 mol dm/sup -3/. The solvents employed were mixtures of 4-butyrolactone with 2-methyltetrahydrofuran varying in compositions from ...
Yoshifumi Harada   +2 more
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Liquid chromatography—thermospray mass spectrometric study of N-acylamino dilactones and 4-butyrolactones derived from antimycin A

Journal of Chromatography A, 1990
Abstract Reversed-phase high-performance liquid chromatography—thermospray mass spectrometric (HPLC—MS) characteristics of four sets of lactonic complexes (one 4-butyrolactones and three dilactone complexes) derived from antimycin A were investigated. Three types of 8-hydroxy analogues were also included in the study. Pairs of a–b structures isomeric
S.L. Abidi, S.C. Ha, R.T. Rosen
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