The best known of these techniques often features counterflow addition and the use of syringes and septa.
Preparation of some devices used for these techniques require a column of heated copper metal which is reusable if hydrogen and nitrogen are subsequently passed through it. Reagents can be prepared for use with these techniques by refluxing with sodium wire and benzophenone, which is reduced to ketyl radical anion. Careful control of pressure allows for a reagent transfer technique called cannulation. A distillation procedure that is one of these techniques employs a Perkin triangle. Reactions requiring these precautions include couplings that use palladium zero ligated to triphenylphosphine, as well as the use of organozinc and organolithium. The best known of these techniques often features counterflow addition and the use of syringes and septa. For 10 points, name this set of laboratory techniques that include the use of a glove box, as well as employing a Schlenk line to deliver a neutral gas like nitrogen or argon.
Preparation of some devices used for these techniques require a column of heated copper metal which is reusable if hydrogen and nitrogen are subsequently passed through it.
{air}-{free} techniques [or {inert} techniques; accept {moisture}-{free techniques} and equivalents before “{Perkin triangle}” is read; accept {clear}-{knowledge} equivalents that {indicate} that a {reaction's atmosphere} is {being controlled}]