1 The Diels-Alder reaction is a conjugate addition reaction of a conjugated diene to an alkene (the dienophile) to produce a cyclohexene. 2  The simplest example is the reaction of 1,3-butadiene with ethene to form cyclohexene:3  The analogous reaction of 1,3-butadiene with ethyne to form 1,4-cyclohexadiene is also known: Due to the high degree of regio-and stereoselectivity (due to the concerted mechanism), the Diels-Alder reaction is a very powerful reaction and is widely used in synthetic organic chemistry.
Best Answer: Buyers have up 7 days to pay for an item before you as a seller can open an unpaid item case with ebay. They have a whole process they ask that sellers follow: Buyers automatically enter into a legally binding contract to purchase the item from the seller if they win an online auction or use the Buy It Now feature.
When selling your vehicle, you have the option of an auction-style or fixed price selling format. Auction-style durations: 3, 5, 7, or 10 days. (There's an extra fee for 10-day duration.). Fixed price durations: 3, 5, 7, 10, or 21 days.(There's an extra fee for 10 and 21-day durations.). eBay Motors fees vary depending on how many vehicles you sell in a calendar year.nce you become a high-volume seller, you're permanently a high-volume seller and high-volume selling fees apply. Seller A has never listed on eBay Motors. He lists 2 cars between January 1 and July 30.