Sentence examples for intractable products from inspiring English sources

We tested the oxidation of 3 with common oxygen-atom-transfer reagents and found that whilst morpholine N-oxide, pyridine- N-oxide, and trimethylamine- N-oxide all gave intractable products, tetramethylpiperidine- N-oxide (TEMPO) effected clean oxidation to afford the black uranium VI) carbene imido oxo complex [{U BIPMTMS)(NMes)(μ-O }2] (4) as a crystalline product in 57 % yield.

We investigated alternative methods of producing 3, by preparing [U TrenTIPS)(AsHK)] and treating it with oxidants to effect homocoupling; however, adding stoichiometric iodine, lead II) iodide, TEMPO, pyridine- N-oxide, 4-morpholine- N-oxide, trimethylamine- N-oxide, silver tetraphenylborate, and copper(I) iodide all gave intractable products.

To prepare 2, the KAsH2 reagent has to be finely ground, otherwise intractable product mixtures are obtained.[ 15] However, on one occasion a small crop of dark brown crystals of [{U TrenTIPS }2 μ-η:η-As2 μ-η (3) was obtained in about 1 % yield.

Compared to biogenic macromolecules or synthetically intractable natural products, small molecule adjuvants have many potential advantages.

It's a sharp change from the early 1990s, when Mexico City's problems seemed intractable – a product of unfavorable geography and poor urban planning, Mr. Velasco says.

In practice, formation of an intractable mixture of products led us to decouple the thiolation and hydrolysis steps by employing a diprotic nucleophile (Scheme 15).

There is a tendency to see the problem, which has survived a series of local and federal initiatives, as intractable, the tragic product of a history of deprivation and discrimination.

RF7a effectively achieves hemostasis in patients with intractable bleeding, reducing blood product transfusions within 6 hours of treatment.

Recently, response surface methodology (RSM) has been accepted for modeling and optimizing of input intractable variables to achieve maximum yield product as output for productive process [21].

(3) The factor products, which are mathematically intractable, are solved by an unscented particle filtering.

Trained as a pharmaceutical chemist, he was the founder of Dermik Labs and developed innovative products for the treatment of intractable skin problems.