Welding welding was invented in 1893, and around that time another process, oxyfuel welding, became well established. Acetylene was discovered in 1836 by Edmund Davy, but its use was not practical in welding until about 1900, when a suitable torch was developed. At first, oxyfuel welding was one of the more popular welding methods due to its portability and relatively low cost. As the 20th century progressed, however, it fell out of favor for industrial applications. It was largely replaced with arc welding, as advances in metal coverings (known as flux) were made. Flux covering the electrode primarily shields the base
Bis(trimethylsilyl)acetylene key step in this synthesis was the formation of the steroidal skeleton, catalyzed by CpCo(CO). BTMSA also serves as a ligand in organometallic chemistry. For example, it forms stable adducts with metallocenes. BTMSA is also used in the total synthesis of epibatidine (and analogs), and also in the synthesis of iclaprim. Bis(trimethylsilyl)acetylene Bis(trimethylsilyl)acetylene (BTMSA) is an organosilicon compound with the formula C(Si(CH)). It is a colorless liquid that is soluble in organic solvents. This compound is used as a surrogate for acetylene. BTMSA is prepared by treating acetylene with butyl lithium followed by addition of chlorotrimethylsilane: BTMSA is used as