CHEM164 Lecture Notes - Lecture 22: Hevea Brasiliensis, Vulcanization, Isoprene
18 Mar 2015
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In nature it may be obtained from dandelion plant; extracted white sap (latex) is used to prepare latex and then rubber as a sticky gum (100 lbs/acre). Rubber tree: hevea brasiliensis (~ 2500 lb rubber/acre). Conjugated carbocation: positive charge is separated by single bond from double bond (increases stability of the cation). addition. Different possibilities for polymerization, however the trans form is the favored pathway: Rubber + carbon + sulphur vulcanised rubber now elastic. 1 single bond from a double bond and can refer to a double bond (as in isoprene) or to an intermediate, such as radical, cation, or anion. Lecture outline & assignment 5 alcohols and ethers. Find the longest chain with the oh and. Number from end to give oh the lowest number. Ch3ch2oh - ethanol (grain alcohol or ethyl alcohol) Ch3ch2ch2oh - propanol (propan-1-ol, n-propanol, or n-propyl alcohol)
