Cannabinoids alternative production

Presumptive tests for cannabis products are used to test for the presence (or otherwise) of phenolic cannabinoids. The principle one that is used is the Duquenois-Levine test. An alternative which is available and can also be used is the Corinth IV salt test. Both involve a reaction between the cannabinoids and a test reagent to form coloured products. Positive and negative control tests should also be carried out. 

A. Specific levels. Blood levels are not commonly available. Cannabinoid metabolites may be detected in the urine by enzyme immunoassay for up to several days after single acute exposure or weeks after chronic THC exposure. Urine levels do not correlate with degree of intoxication or functional impairment. Hemp and hemp seed products (eg, hemp seed nutrition bars) may provide alternative explanations for positive urine testing. While barely capable of causing a tme positive for THC metabolite, they have no phanoacologic effect. 

As natural products do not always have the double bond in the 1,4-pyran ring, there exists the need to have alternative building blocks at different oxidation states. For example, resorcinol 37 was reacted with acrylic acid 38 promoted by BF3 to provide a high yield of chromone 39, which was used to prepare a cannabinoid plant extract. ... 

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