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Ultrasonic-Assisted Extraction of Cannabidiolic Acid from Cannabis Biomass
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使用基于变压器的主题建模来检查Delta-8四大麻素的讨论:内容分析

Brandi Patrice Smith1, Brooke Hoots2,3, Lara DePadilla2

  • 1Office of Strategy and Innovation, National Center for Injury Prevention and Control, Centers for Disease Control and Prevention, Atlanta, GA, United States.

Journal of medical Internet research
|December 21, 2023
PubMed
概括

德尔塔-8四大麻 (THC) 越来越多地在网上讨论,人们越来越多地提到焦虑和呼吸问题等健康问题. 这项研究使用人工智能分析社交媒体帖子,揭示了与delta-8THC使用相关的新兴公共卫生问题.

关键词:
大麻大麻大麻大麻大麻大麻大麻大麻德尔塔-8四化大麻醇 (Delta-8 Tetrahydrocannabinol) 是一种可吸收的药物.机器学习是机器学习.大麻大麻大麻大麻是什么意思自然语言处理自然语言处理.公共卫生监督公共卫生监督社交媒体 社交媒体主题建模主题建模

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Radical Halogenation: Stereochemistry

Stereochemistry is the study of the different spatial arrangements of atoms in a given molecule. The stereochemistry of radical halogenations can be understood from three different situations:
Halogenation to form a new chiral center:
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α-Halogenation of Carboxylic Acid Derivatives: Overview

Unlike aldehydes and ketones, carboxylic acids do not readily participate in α halogenation reactions via enols or enolate intermediates. However, α-halogenated acids are obtained through other methods. One of the approaches is the Hell–Volhard–Zelinsky (HVZ) reaction, wherein the carboxylic acid is treated with halogen in the presence of PBr3. It involves the conversion of acid to acid halide, which exists in equilibrium with its enol form. The enol attacks the...
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Inductive Effects on Chemical Shift: Overview

The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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