A simple synthesis and purification of 1-ferrocenylalkyl alcohols

An alternative method for the preparation of 1-ferrocenylalkyl alcohols has been developed. This involves condensation of ferrocene with carbonyl compounds in concentrated sulfuric acid and addition of the resulting solutions of 1-ferrocenylalkylium ions into aqueous sodium bicarbonate. The mixtures are then treated with thioglycolic acid and the S-(1-ferrocenylalkyl)thioglycolic acids purified via sodium salts and hydrolysed in the presence of copper powder to give 1-ferrocenylalkyl alcohols in good yields.     

Criterion of polynomial increase of a function and its derivatives

ДОкАжАНО, ЧтО Дль тОгО, ЧтОБы Дльr РАж ДИФФЕРЕНцИРУЕМОИ НА пРОМЕжУткЕ [А, + ∞) ФУНкцИИf сУЩЕстВОВА л тАкОИ МНОгОЧлЕН (1) $$P(x) = \mathop \Sigma \limits_{\kappa = 0}^{r - 1} a_k x^k ,$$ , ЧтО (2) $$\mathop {\lim }\limits_{x \to + \infty } (f(x) - P(x))^{(k)} = 0,k = 0,1,...,r - 1,$$ , НЕОБхОДИМО И ДОстАтО ЧНО, ЧтОБы схОДИлсь ИН тЕгРАл (3) $$\int\limits_a^{ + \infty } {dt_1 } \int\limits_{t_1 }^{ + \infty } {dt_2 ...} \int\limits_{t_{r - 1} }^{ + \infty } {f^{(r)} (t)dt.}$$ ЕслИ ЁтОт ИНтЕгРАл сх ОДИтсь, тО Дль кОЁФФИц ИЕНтОВ МНОгОЧлЕНА (1) ИМЕУт МЕс тО ФОРМУлы $$\begin{gathered} a_{r - m} = \frac{1}{{(r - m)!}}\left( {\mathop \Sigma \limits_{j = 1}^m \frac{{( - 1)^{m - j} f^{(r - j)} (x_0 )}}{{(m - j)!}}} \right.x_0^{m - j} + \hfill \\ + ( - 1)^{m - 1} \left. {\mathop \Sigma \limits_{l = 0}^{m - 1} \frac{{x_0^l }}{{l!}}\int\limits_a^{ + \infty } {dt_1 } \int\limits_{t_1 }^{ + \infty } {dt_2 ...} \int\limits_{t_{m - l - 1} }^{ + \infty } {f^{(r)} (t_{m - 1} )dt_{m - 1} } } \right),m = 1,2,...,r. \hfill \\ \end{gathered}$$ ДОстАтОЧНыМ, НО НЕ НЕОБхОДИМыМ Усл ОВИЕМ схОДИМОстИ кРА тНОгО ИНтЕгРАлА (3) ьВльЕтсь схОДИМОсть ИНтЕгРАл А \(\int\limits_a^{ + \infty } {x^{r - 1} f^{(r)} (x)dx}\)      

Oпpeдeлehиe othocиteлъhoгo pacпoлoжehия heкomБиhиpyющиx элeкtpohhъix coctoяhий дbyxatomhъix moлeкyл. Ochobhoe элeкtpohhoe coctoяhиe ZrO

A method is proposed for determining the energy difference of noncombining electronic states and the type of ground electronic state of molecules, based on studying the temperature dependence of integral absorption coefficients of molecular bands in a reflected shock wave plasma over a wide range of temperatures. The method is used to determine the relative position of singlet and triplet ZrO electronic states. As the result of measurements of integral absorption coefficients of 0, 0 bands of ${}^1\text{Σ}{}^{\mathrm{+}}\text{-}{}^1\text{Σ}{}^{\mathrm{+}}$ and ${}^3\text{Δ -}{}^3\text{Δ}$ systems in the temperature interval 3370–5200°K, it is shown that ¹Σ⁺ state is the ZrO ground state, whilst T₀(a³Δ) = 1700 ± 250 cm^-1.     

Иэmepehиe кoлeбateлъhьix temпepatУp moлeкУл b ochobhom элeкtpohhom coctoяhии metoдom oбpaщehия cпeкtpaльhьix лиhй b иhΦpaкpachŏ oблactи cлeкtpa. CO2-лaфep

The line-reversal method for determination of vibrational temperatures of molecules in their ground states has been applied to nonequilibrium, low-pressure plasmas. The feasibility of employing low-resolution apparatus is demonstrated. The method was used for measurements on a series of vibrational-rotational transitions with allomance for anharmonicities. The apparatus is described; measurements were carried out in disharges representative of CO₂-lasers. The accuracy of measurement is discussed.     

Получение изотопа С13 методом ректиФикации окиси углерода

A prompt activation technique – detection of the α-particles with surface barrier silicon and solid state track detectors, detection of the γ rays with (GeLi) detector – based on the ¹⁰B(n, α)⁷Li nuclear reaction was applied for boron determination using a time-of-flight technique on the IBR-30 pulsing reactor. The method was used for measurement of the boron concentration and distribution in bean and maize leaves.