By Gloria Skurzynski

ISBN-10: 1426309686

ISBN-13: 9781426309687

Grizzly cubs are disappearing from Glacier nationwide Park, and the Landon kin needs to determine why! yet for Jack, the true secret is his sister Ashley's unusual habit. What was once she doing on my own within the woods so early within the morning? And why did she mislead their mom and dad? Jack's efforts to resolve the reality bring about a pulse-pounding event that brings the Landon teenagers nose to nose with an enraged grizzly--as Jack and his sister without notice develop into the hunted.

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Extra resources for The Hunted (Mysteries in Our National Park, Book 5)

Example text

C h e m i c a l Properties In the following Sections the chemical properties of biguanide and its derivatives are systematically considered. Attention may be drawn to the particularly extensive and detailed recent studies concerning biguanides 412 The Chemistry of Biguanides as sources of guanamines and pyrimidines (Section H). The basic nature and properties of biguanides have already been dealt with in Section VI B. A. Thermal Decomposition 1. Arylbiguanides The thermal decomposition of phenylbiguanide, both in the presence and absence of ammonium chloride and aniline hydrochloride, has been studied in some detail (669) with the following results (equations 1 and 2, R ----Ph) : R _ N H .

The reaction has been extended to 1,1disubstituted biguanides (548) and to several other examples (767, 527). 419 F. Kurzer and E. D. Pitchfork H . Condensation w i t h Esters The reaction of biguanides with esters was first studied in detail by Rackmann (578) who showed that ethyl formate and arylbiguanides gave 2,4-diamino-6-substituted s-triazines (LXXXIII, where R', R" and R" may vary widely). ~NIII q- AlkOH +HgO NHR' (LXXXm} 1. Saturated Esters In 1940, phenylbiguanide and ethyl formate were reported (735) to react at room temperature to give a triazine, also formed on fusion of phenylbiguanide and diphenylformamide at 145 ~ Further experience gained with Paludfine (t55)showed that the products were N~-arylguanamines (LXXXII[; R ' = P h , R ' : R m = H ; or R'=p-C1C~H4; R*=Pr~; R " ~ H).

In the presence of too high a concentration of acid, however, amidinoureas will result (572, 730). Thus, the appropriate reactants give the desired 1-arylbiguanides in boiling 12% hydrochloric acid, but yield N-amidino-N'arylureas in 22% acid. Since 22% hydrochloric acid converts the biguanide into the amidinourea (730), support is provided for the primary formation of the biguanides. NH2 II n 0 NFI A r N H 2 + HsN" C. N H . CN 22% HCI Zl NH ""~0/-"* A r N H 9C- N H . C. N H s II Ii NH NH Time, as well as acid concentration, is a factor controlling the nature of the product.

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The Hunted (Mysteries in Our National Park, Book 5) by Gloria Skurzynski


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